In other words, 491 miligrams is 8,390 times the weight of a Grain of Salt, and the weight of a Grain of Salt is 0.000119 times that amount.

The mass of a grain of salt is approximately 0.0585 mgs. Salt consumption varies widely by country; the people of the United States consume a combined total of about 2,730,000,000,000 miligrams of salt each year.

In other words, the weight of a Poppy Seed is 0.00063 times 491 miligrams.

(Papaver somniferum)Fifty percent oil by weight, a poppy seed weighs approximately 0.3 mg. The true pigment of a poppy seed is brown in color, while the characteristic bluish color is an optical illusion caused by a layer of calcium oxalate crystals refracting light rays.

In other words, 491 miligrams is 135 times the weight of a Sesame Seed, and the weight of a Sesame Seed is 0.00741 times that amount.

(Sesamum indicum)A sesame seed weighs approximately 3.64 mg. The McDonald's Big Mac sandwich, which is well-known for its sesame seed top bun, accounts for the consumption of an estimated 2,010,000,000 miligrams of sesame seeds each day.

In other words, 491 miligrams is 110 times the weight of a Grain of Sand, and the weight of a Grain of Sand is 0.0091 times that amount.

(medium grain)With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 4.4 mg. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15.10 m (49.55 ft) in height.

In other words, the weight of a Grain of Rice is 0.059 times 491 miligrams.

(long grain; 14% moisture content)A single long grain of rice weighs an average of 29 mg. A staple through most of human history, archaeological evidence indicates that the earliest rice cultivation was about 11,500 years ago.

(a.k.a. drop, a.k.a. droplet) (average)The weight of a raindrop depends heavily on the type of weather, but averages about 200 mg. The familiar teardrop shape of a raindrop is actually an optical illusion, caused by the reflection of the light and the motion of the drop.